Evaluate
12\pi x
Differentiate w.r.t. x
12\pi
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\frac{1}{3}\pi \times 36x
Calculate 6 to the power of 2 and get 36.
\frac{36}{3}\pi x
Multiply \frac{1}{3} and 36 to get \frac{36}{3}.
12\pi x
Divide 36 by 3 to get 12.
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